\def\regeltje{\par\futurelet\n\handlenext}
\def\handlenext{\ifx\n\regeltje\penalty-5000\vskip\baselineskip\vskip 0pt plus 0.3ex\penalty-5000\else\penalty5000\strut\fi}
{\catcode`\^^M=\active % these lines must end with %
  \gdef\obblns{\catcode`\^^M\active \let^^M\regeltje}%
  \global\let^^M\regeltje} % this is in case ^^M appears in a \write
\def\obbspc{\catcode`\ \active}
{\obbspc\global\let =\space}
\newenvironment{litout}{\begingroup\obblns\obbspc\parskip 0pt}{\endgroup}